TASK ERROR: MAX 6 vcpus allowed per VM on this node

[mammutserver]

I just rebooted my server and one VM did not start with the error "TASK ERROR: MAX 6 vcpus allowed per VM on this node".
My server is runnung on a Intel Xeon E5-2620 v2 with 6 cores (12 with Hyper-Threading). Before the restart the VM was running with 8 vcpus without any problems!

 

[ermanishchawla]

Pls share output of following command

qm config <vmid>

 

[ermanishchawla]

Also pls share output of lscpu command also

 

[mammutserver]

qm config output:

boot: order=ide2;sata0
cores: 8
ide2: none,media=cdrom
memory: 10240
name: space
net0: e1000=F2:8D:6F:EF:67:FF,bridge=vmbr1,firewall=1
numa: 0
onboot: 1
ostype: l26
sata0: hdd:107/vm-107-disk-0.qcow2,size=32G
sata1: hdd2:107/vm-107-disk-0.qcow2,backup=0,size=900G
sata2: hdd:107/vm-107-disk-1.qcow2,backup=0,size=50G
sata3: diskstation01_v2_p2_shr:107/vm-107-disk-0.qcow2,backup=0,size=512G
scsihw: virtio-scsi-pci
smbios1: uuid=2cf1f42c-45be-4bd1-87ae-d73c637948cc
sockets: 1
startup: order=2,up=240
unused0: hdd:107/vm-107-disk-3.qcow2
usb0: host=1-1.1,usb3=1
vmgenid: 91419472-cf6e-4b0b-847c-fd63ff8893c9

lscpu output:

Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
Address sizes:       46 bits physical, 48 bits virtual
CPU(s):              6
On-line CPU(s) list: 0-5
Thread(s) per core:  1
Core(s) per socket:  6
Socket(s):           1
NUMA node(s):        1
Vendor ID:           GenuineIntel
CPU family:          6
Model:               62
Model name:          Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz
Stepping:            4
CPU MHz:             1638.653
CPU max MHz:         2600.0000
CPU min MHz:         1200.0000
BogoMIPS:            4189.56
Virtualization:      VT-x
L1d cache:           32K
L1i cache:           32K
L2 cache:            256K
L3 cache:            15360K
NUMA node0 CPU(s):   0-5
Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti intel_ppin ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts md_clear flush_l1d

 

[ermanishchawla]

It is showing only 6 cores in hardware? And hyperthreading is disabled I guess as thread per core is showing 1. Check your bios whether you disabled hyperthreading

 

[mammutserver]

Hyper-Threading is enabled in BIOS

 

[entilza]

Double check your CPU settings in bios..

 

[ermanishchawla]

Hyper-Threading is enabled in BIOS

No it is not enabled, otherwise lscpu would show 2 threads per core instead of 1